用双圆弧来拟合非圆曲线（如椭圆）

linzhixiao

用双圆弧来拟合非圆曲线（如椭圆）

对这方面有研究的高手，希望能联系我。85315168@vip.163.com

我们出开发费用，请人帮我们兼职开发这方面的算法函数。

huihuo

Here's some java code that should help you out. (modify to suit your
language needs)

If anyone sees any problems with this code, please let me know so I can
fix my stuff :)

float x, y, width, height - these are already set.

float hwidth = width / 2;
float hheight = height / 2;
float ab = (float)(hwidth * (4.0/3.0*(Math.sqrt(2.0)-1.0)));
float cd = (float)(hheight * (4.0/3.0*(Math.sqrt(2.0)-1.0)));

pdf.moveto(x, y + hheight);

// top right
pdf.curveto(x + ab, y + hheight, // B
x + hwidth, y + cd, // C
x + hwidth, y);

// bottom right
pdf.curveto(x + hwidth, y - cd, x + ab, y - hheight, x, y - hheight);

// bottom left
pdf.curveto(x - ab, y - hheight, x - hwidth, y - cd, x - hwidth, y);

// top left
pdf.curveto(x - hwidth, y + cd, x - ab, y + hheight, x, y + hheight);

pdf.moveto(x, y + hheight);

pdf.fill();